/*
 * Alloy Analyzer
 * Copyright (c) 2002 Massachusetts Institute of Technology
 *
 * The Alloy Analyzer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * The Alloy Analyzer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with the Alloy Analyzer; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package alloy.ast;

public class VariableExpr extends LeafExpr {

    /**
     * index of var in child list
     */
    private static final int VAR_INDEX = 0;

    /** true if this VariableExpr represents a quantified
        variable; if false, this VariableExpr represents
        a field. only valid after leaf id has been set */
    public boolean isQuantified;

    public VariableExpr(Location location_, Variable var_) {
        super(location_, var_);
    }


    public VariableExpr(Variable var_) {
        super(Location.UNKNOWN, var_);
    }



    //GET AND SET METHODS

    /**
     * gets the var of this
     * @return the {@link Variable}
     */
    public Variable getVar() {
        return (Variable)childAt(VAR_INDEX);
    }

    /** set the Var of this */
    public void setVar(Variable newChild_) {
        setChild(VAR_INDEX, newChild_);
    }

    /**
     * accept an AST visitor
     * @param visitor_ the visitor
     */
    protected void acceptVisitor(ASTVisitor visitor_) {
        visitor_.visit(this);
    }

    /**
     * accept a returning AST visitor
     * @param visitor_ the visitor
     * @return the Object returned by the visitor
     */
    protected Object acceptReturnVisitor(ASTReturnVisitor visitor_) {
        return visitor_.visit(this);
    }

    public String toString()
    {
        return nodeString();
    }
}















